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Q.

A stone is dropped from a certain height which can reach the ground in 5 s. It is stopped after 3 s of its fall and then it is again released. The total time taken by the stone to reach the ground will be

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a

6 s

b

6.5 s

c

7 s

d

7.5 s

answer is C.

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Detailed Solution

Here h=12×10×(5)2=125mIn 3 s it falls through : h1=12×10×(3)2=45mRest 80 m is covered in 4 s. Hence, total time taken is 3 s + 4 s = 7 s
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